DOI: 10.1007/s10533-017-0402-1
Scopus记录号: 2-s2.0-85035126354
论文题名: Stromatolite records of environmental change in perennially ice-covered Lake Joyce, McMurdo Dry Valleys, Antarctica
作者: Mackey T.J. ; Sumner D.Y. ; Hawes I. ; Leidman S.Z. ; Andersen D.T. ; Jungblut A.D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 137, 期: 2018-01-02 起始页码: 73
结束页码: 92
语种: 英语
英文关键词: Antarctica
; Carbonate
; Isotopes
; Microbial mat
; Stromatolite
Scopus关键词: biogeochemistry
; calcite
; carbon isotope
; carbonate
; dissolved inorganic carbon
; enrichment
; environmental change
; ice cover
; lake level
; microbial activity
; microbial mat
; oxygen isotope
; stratification
; stromatolite
; Antarctica
; East Antarctica
; Lake Joyce
; McMurdo Dry Valleys
英文摘要: Calcite-rich columnar stromatolites grew in perennially ice-covered Lake Joyce in the McMurdo Dry Valleys, Antarctica, during a period of environmental change associated with rising lake level. Stromatolite calcite contains carbon and oxygen isotope records of changes to microbial activity in response to variable light environments and water chemistry through time. The stromatolites grew synchronously with correlative calcite zones. The innermost (oldest) calcite zone has a wide range of δ13Ccalcite values consistent with variable photosynthetic effects on local DIC 13C/12C. Subsequent calcite zones preserve a progressive enrichment in δ13Ccalcite values of approximately + 2.6‰ through time, with δ13Ccalcite values becoming less variable. This enrichment likely records the removal of 12C by photosynthesis from the DIC reservoir over decades, with photosynthetic effects decreasing as light levels became lower and more consistent through time. Mean δ18Ocalcite values of the innermost calcified zone were at least 1‰ lower than those of the other calcified zones (t test p-level < 0.001). The significant difference in δ18Ocalcite values between the innermost and other calcified zones could be a product of mixing source waters with different isotopic values associated with the initiation of lake stratification associated with rising lake level. Overall, Lake Joyce stromatolites record significant lateral variability in relative photosynthetic rate and long-lived lake water stratification with microbial modification of the DIC pool. Such processes provide criteria for interpreting microbial activity within polar paleolake deposits and may shed light on variability in lake environments associated with changing climate in the McMurdo Dry Valleys. © 2017, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83197
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, United States; Department of Earth and Planetary Sciences, University of California–Davis, 1 Shields Avenue, Davis, CA, United States; Tauranga Coastal Research Laboratory, University of Waikato, 58 Cross Road, Tauranga, New Zealand; Department of Geography, Rutgers, The State University of New Jersey, Piscataway, NJ, United States; Carl Sagan Center, SETI Institute, Mountain View, CA, United States; Department of Life Sciences, The Natural History Museum, Cromwell Road, London, United Kingdom
Recommended Citation:
Mackey T.J.,Sumner D.Y.,Hawes I.,et al. Stromatolite records of environmental change in perennially ice-covered Lake Joyce, McMurdo Dry Valleys, Antarctica[J]. Biogeochemistry,2018-01-01,137(2018-01-02)